:root{
  --xh-support-fab-size:54px;
  --xh-support-fab-inset:22px;
  --xh-support-fab-gap:12px;
  --xh-support-backtop-size:46px;
}
.xh-support-fab{
  position:fixed;right:max(22px,env(safe-area-inset-right));bottom:max(var(--xh-support-fab-inset),env(safe-area-inset-bottom));z-index:9000;
  width:auto;min-width:var(--xh-support-fab-size);height:var(--xh-support-fab-size);
  padding:0 16px 0 14px;border:0;border-radius:999px;cursor:pointer;
  background:var(--xh-accent,#23654a);color:#fff;
  font-size:15px;font-weight:800;letter-spacing:.04em;line-height:1;
  box-shadow:0 10px 28px color-mix(in srgb,var(--xh-accent,#23654a) 35%,transparent);
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  white-space:nowrap;overflow:visible;
  transition:transform .18s ease,box-shadow .18s ease;
}
.xh-support-fab > b{
  display:inline;margin:0;padding:0;
  font-size:15px;font-weight:800;line-height:1;color:inherit;
  letter-spacing:.06em;
}
.xh-support-fab:hover{transform:translateY(-2px)}
.xh-support-fab[aria-expanded="true"]{background:var(--xh-text,#13251f)}
.xh-support-badge{
  position:absolute;top:-2px;right:-2px;min-width:18px;height:18px;padding:0 5px;
  border-radius:999px;background:#e5484d;color:#fff;font-size:11px;font-weight:700;
  display:none;place-items:center;border:2px solid var(--xh-bg,#f4f7f6);
}
.xh-support-badge.show{display:grid}
.xh-support-panel{
  position:fixed;right:max(22px,env(safe-area-inset-right));
  bottom:calc(max(var(--xh-support-fab-inset),env(safe-area-inset-bottom)) + var(--xh-support-fab-size) + var(--xh-support-fab-gap));
  z-index:9000;
  width:min(360px,calc(100vw - 32px));height:min(480px,calc(100vh - 120px));
  border-radius:18px;border:1px solid var(--xh-line,#dfe5e3);
  background:var(--xh-surface,#fff);box-shadow:0 24px 60px rgba(16,24,40,.14);
  display:none;flex-direction:column;overflow:hidden;
}
.xh-support-panel.open{display:flex}
.xh-support-head{
  padding:14px 16px;border-bottom:1px solid var(--xh-line,#e5e7eb);
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  background:color-mix(in srgb,var(--xh-surface,#fff) 90%,var(--xh-accent-soft,#e9faee));
}
.xh-support-head h3{margin:0;font-size:15px;font-weight:800;color:var(--xh-text,#101820)}
.xh-support-head p{margin:2px 0 0;font-size:12px;color:var(--xh-muted,#697586)}
.xh-support-close{
  width:32px;height:32px;border:0;border-radius:8px;cursor:pointer;
  background:transparent;color:var(--xh-muted,#697586);font-size:18px;
}
.xh-support-body{flex:1;overflow:auto;padding:14px 12px;background:var(--xh-bg,#f7f9f8)}
.xh-support-msg{max-width:88%;margin:0 0 10px;padding:9px 12px;border-radius:14px;font-size:13px;line-height:1.6;word-break:break-word;white-space:pre-wrap}
.xh-support-msg.user{margin-left:auto;background:var(--xh-accent,#23654a);color:#fff;border-bottom-right-radius:4px}
.xh-support-msg.admin{margin-right:auto;background:var(--xh-surface,#fff);color:var(--xh-body,#374151);border:1px solid var(--xh-line,#e5e7eb);border-bottom-left-radius:4px}
.xh-support-msg time{display:block;margin-top:4px;font-size:10px;opacity:.72}
.xh-support-empty{padding:28px 12px;text-align:center;color:var(--xh-muted,#697586);font-size:13px;line-height:1.7}
.xh-support-login{padding:24px 16px;text-align:center}
.xh-support-login p{margin:0 0 12px;font-size:13px;color:var(--xh-muted,#697586)}
.xh-support-login a{
  display:inline-flex;padding:9px 16px;border-radius:999px;
  background:var(--xh-accent,#23654a);color:#fff;font-size:13px;font-weight:700;
}
.xh-support-foot{
  padding:10px 12px 12px;border-top:1px solid var(--xh-line,#e5e7eb);
  background:var(--xh-surface,#fff);
}
.xh-support-foot textarea{
  width:100%;min-height:72px;max-height:120px;resize:vertical;
  border:1px solid var(--xh-line,#dfe5e3);border-radius:12px;padding:10px 12px;
  font:inherit;font-size:13px;line-height:1.5;color:var(--xh-text,#101820);
  background:var(--xh-bg,#f9fafb);
}
.xh-support-foot textarea:focus{outline:2px solid color-mix(in srgb,var(--xh-accent,#23654a) 35%,transparent);border-color:var(--xh-accent,#23654a)}
.xh-support-actions{display:grid;grid-template-columns:1fr auto auto;align-items:center;margin-top:8px;gap:8px}
.xh-support-hint{font-size:11px;color:var(--xh-muted,#697586)}
.xh-support-hint#xhSupportCounter{text-align:right;min-width:42px}
.xh-support-send{
  border:0;border-radius:999px;padding:8px 16px;cursor:pointer;
  background:var(--xh-accent,#23654a);color:#fff;font-size:13px;font-weight:700;
}
.xh-support-send:disabled{opacity:.55;cursor:not-allowed}
@keyframes xh-support-shake{
  0%,100%{transform:translateX(0)}
  15%{transform:translateX(-5px) rotate(-1deg)}
  30%{transform:translateX(5px) rotate(1deg)}
  45%{transform:translateX(-4px)}
  60%{transform:translateX(4px)}
  75%{transform:translateX(-2px)}
}
.xh-support-shake{animation:xh-support-shake .55s ease-in-out}
.xh-support-fab.xh-support-shake{animation:xh-support-shake .55s ease-in-out}
.xh-support-toast{
  position:fixed;right:max(22px,env(safe-area-inset-right));
  bottom:calc(max(var(--xh-support-fab-inset),env(safe-area-inset-bottom)) + var(--xh-support-fab-size) + var(--xh-support-fab-gap));
  z-index:9001;
  max-width:min(300px,calc(100vw - 40px));padding:12px 14px;border-radius:14px;
  background:var(--xh-surface,#fff);border:1px solid color-mix(in srgb,var(--xh-accent,#23654a) 35%,#dfe5e3);
  box-shadow:0 16px 40px rgba(16,24,40,.16);cursor:pointer;
  display:none;flex-direction:column;gap:4px;
}
.xh-support-toast.show{display:flex}
.xh-support-toast strong{font-size:13px;color:var(--xh-text,#101820)}
.xh-support-toast span{font-size:12px;line-height:1.5;color:var(--xh-muted,#697586)}
/* 与右下角客服 FAB 同页时，返回顶部按钮堆叠在其上方 */
body:has(#xhSupportRoot) #backToTop{
  bottom:calc(max(var(--xh-support-fab-inset),env(safe-area-inset-bottom)) + var(--xh-support-fab-size) + var(--xh-support-fab-gap));
  z-index:10041;
}
body:has(#xhSupportRoot) .xh-support-panel.open{
  bottom:calc(max(var(--xh-support-fab-inset),env(safe-area-inset-bottom)) + var(--xh-support-fab-size) + var(--xh-support-fab-gap) + var(--xh-support-backtop-size) + var(--xh-support-fab-gap));
}
body:has(#xhSupportRoot) .xh-support-toast.show{
  bottom:calc(max(var(--xh-support-fab-inset),env(safe-area-inset-bottom)) + var(--xh-support-fab-size) + var(--xh-support-fab-gap) + var(--xh-support-backtop-size) + var(--xh-support-fab-gap));
}
@media(max-width:620px){
  :root{--xh-support-fab-inset:16px}
  .xh-support-panel{
    right:max(16px,env(safe-area-inset-right));
    width:calc(100vw - 32px);
  }
}